There is a reason why there are so few photos of Lucy Liu and her boyfriend Noam Gottesman — 24/7 security.

The “Elementary” actress has been dating the Israeli-American hedge-fund billionaire for almost four years. But they don’t go out in public much. “And he has Israeli bodyguards follow her around,” one source told me.

Gottesman invested in the record company of Lyor Cohen, the former Warner Music chief, and lives near him on Jane Street, where Gottesman bought an old factory for $34 million and tore it down to build a 12,000-square-foot mansion. He also owns an estate in Hampshire, England, where he’s reportedly hosted the likes of Beyoncé and Jay Z.

With an art collection that includes works by Andy Warhol, Francis Bacon and Lucian Freud, Gottesman is said to be helping Liu with her career as an artist. She’s been painting since the ’90s.